You may try running a repair of the program from the Control Panel > Applications list. (If you are running Windows.) Basically follow the same steps you would to Uninstall the program. Bring up the Control Panel. Find Programs. Select Uninstall a Program. Click on Dreamweaver. When it is highlight, look toward the top of the window for a "Change" or "Repair" option. If there isn't one. Click "Uninstall" but BE VERY CAREFUL. Once the Uninstall box pops up there may be a radio button (like an option to click) for "Repair" - That should restore any lost files and hopefully resolve the issue. Otherwise, a complete uninstall and reinstall may be warranted. Hope this helps! - Cheers! (See image for example)